<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <div id="app">
        <input type="text" :value="val" @input="changeVal">
        <input type="checkbox" :checked="checkVal" @change="changeCheck">checkbox
    </div>
    <script src="https://cdn.jsdelivr.net/npm/vue@2/dist/vue.js"></script>
    <script>
        var app = new Vue({
            el: '#app',
            data: {
                val: "",
                checkVal: true
            },
            methods: {
                changeVal(e) {
                    this.val = e.target.value;
                },
                changeCheck(e) {
                    this.checkVal = e.target.checked
                    console.log(this.checkVal)
                }
            },
        })
    </script>
</body>

</html>